Hybrid Vehicle Regenerative Control for Heating Stability
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Solution Overview
Problem
Hybrid vehicles face challenges in simultaneously maintaining regenerative braking performance and heating performance due to fluctuations in regenerative electric power generation, which can lead to unstable air conditioning performance and inadequate heating when the engine is not operating.
Innovation Solution
A regenerative control device that includes a determiner to assess the operation of a heating device and battery charging status, and a controller to perform parallel firing and motoring controls, setting target torques to manage engine and motor operations during regenerative power generation, ensuring compatible regenerative braking and heating performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If regenerative electric power is consumed by an air conditioning system, then it is possible to secure a braking force without overheating the battery, but fluctuation in air conditioning capacity increases and heating performance becomes insufficient
Solution Approach 1:
The patent introduces a control device as an intermediary that coordinates between the regenerative braking system and the air conditioning system. This controller mediates the allocation of regenerative electric power, determining when to charge the battery, when to power the air conditioning system, and when to dissipate excess power through the motor generator, thereby balancing braking stability and air conditioning performance
Solution Approach 2:
The system dynamically adjusts the operation mode of the motor generator between generating regenerative braking power and consuming excess power as a rotational load. The control device continuously monitors battery charge state, regenerative power availability, and air conditioning demands to flexibly switch between these modes, optimizing both braking performance and air conditioning stability
2Reliability
If the engine is stopped or forcibly driven to rotate to consume regenerative electric power, then regenerative braking can be regulated, but heat is not generated and heating performance cannot be secured
Solution Approach 1:
The control device changes the operational parameters of the engine and motor generator based on real-time conditions. When heating is required and regenerative power is available, the system adjusts the engine operation mode and motor generator torque to maintain both regenerative braking capability and engine heat generation, rather than simply stopping or forcibly rotating the engine
3Use of energy by moving object
If the traveling battery is charged with regenerative electric power during travel, then energy efficiency is improved, but the battery may be overcharged when the battery is almost fully charged
Solution Approach 1:
The control device implements a feedback mechanism that continuously monitors the battery charge state and adjusts the regenerative braking control accordingly. When the battery approaches full charge, the system receives feedback about the charge state and automatically reduces or stops charging, preventing overcharge while maximizing energy recovery during periods when the battery can accept charge
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances both regenerative braking and heating performance by stabilizing engine rotation and efficiently consuming regenerative power, even when the battery is fully charged, thereby improving overall vehicle performance.
Implementation Method 1
a heating device for heating the inside of a cabin often has a mechanism for generating hot air using heat generated in an engine
Implementation Method 2
when regenerative power generation is carried out in the traveling motor during travel
Data Source
AI summary
A regenerative control device of a vehicle an engine; a first motor; a second motor performing regenerative power generation; a battery connected to the first and second motors; and a heating device heating using heat, includes: a determiner determining whether the heating device is in operation or not, and determining whether charging the battery is regulated or not; and a controller performing parallel firing control in which a driving force is given to the engine by the first motor while burning fuel in the engine, during the regenerative power generation when the heating device is in operation and charging the battery is regulated, and setting a target torque of the engine in the parallel firing control to be equal to or lower than a burning limit torque of the engine.